Acyl Homoserine Lactone
Mostrando 1-12 de 102 artigos, teses e dissertações.
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1. Roles of quorum sensing molecules from Rhizobium etli RT1 in bacterial motility and biofilm formation
ABSTRACT Strain RT1 was isolated from root nodules of Lens culinaris (a lentil) and characterized as Rhizobium etli (a Gram-negative soil-borne bacterium) by 16S rDNA sequencing and phylogenetic analysis. The signaling molecules produced by R. etli (RT1) were detected and identified by high-performance liquid chromatography coupled with mass spectrometry. Th
Braz. J. Microbiol.. Publicado em: 2017-12
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2. Acyl-homoserine lactones from the phytopathogenic bacteria Pantoea ananatis and Methylobacterium mesophilicum and chemical defense in the harvestman Hoplobunus mexicanus / Acil-homosserina lactonas produzidas pelas bacterias fitopatogenicas Pantoea ananatis e Methylobacterium mesophilicum e defesa quimica no opilião Hoplobunus mexicanus
As bactérias Gram-positivas e Gram-negativas possuem um mecanismo de comunicação química intra-específico conhecido como ¿quorum-sensing¿, regulando a expressão de uma vasta gama de atividades biológicas. As bactérias Gram-negativas utilizam acil-homosserina lactonas (acil-HSLs) como principais substâncias sinalizadoras. Na presente tese, relatamo
Publicado em: 2009
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3. Long-Chain Acyl-Homoserine Lactone Quorum-Sensing Regulation of Rhodobacter capsulatus Gene Transfer Agent Production
Many proteobacteria use acyl-homoserine lactones as quorum-sensing signals. Traditionally, biological detection systems have been used to identify bacteria that produce acyl-homoserine lactones, although the specificities of these detection systems can limit discovery. We used a sensitive approach that did not require a bioassay to detect production of long-
American Society for Microbiology.
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4. Generation of cell-to-cell signals in quorum sensing: acyl homoserine lactone synthase activity of a purified Vibrio fischeri LuxI protein.
Many bacteria use acyl homoserine lactone signals to monitor cell density in a type of gene regulation termed quorum sensing and response. Synthesis of these signals is directed by homologs of the luxi gene of Vibrio fischeri. This communication resolves two critical issues concerning the synthesis of the V. fischeri signal. (i) The luxI product is directly
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5. Detecting and characterizing N-acyl-homoserine lactone signal molecules by thin-layer chromatography
Many Gram-negative bacteria regulate gene expression in response to their population size by sensing the level of acyl-homoserine lactone signal molecules which they produce and liberate to the environment. We have developed an assay for these signals that couples separation by thin-layer chromatography with detection using Agrobacterium tumefaciens harborin
The National Academy of Sciences of the USA.
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6. In Vivo Evidence that S-Adenosylmethionine and Fatty Acid Synthesis Intermediates Are the Substrates for the LuxI Family of Autoinducer Synthases
Many gram-negative bacteria synthesize N-acyl homoserine lactone autoinducer molecules as quorum-sensing signals which act as cell density-dependent regulators of gene expression. We have investigated the in vivo source of the acyl chain and homoserine lactone components of the autoinducer synthesized by the LuxI homolog, TraI. In Escherichia coli, synthesis
American Society for Microbiology.
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7. Metabolism of Acyl-Homoserine Lactone Quorum-Sensing Signals by Variovorax paradoxus
Acyl-homoserine lactones (acyl-HSLs) serve as dedicated cell-to-cell signaling molecules in many species of the class Proteobacteria. We have addressed the question of whether these compounds can be degraded biologically. A motile, rod-shaped bacterium was isolated from soil based upon its ability to utilize N-(3-oxohexanoyl)-l-homoserine lactone as the sole
American Society for Microbiology.
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8. gfp-Based N-Acyl Homoserine-Lactone Sensor Systems for Detection of Bacterial Communication
In order to perform single-cell analysis and online studies of N-acyl homoserine lactone (AHL)-mediated communication among bacteria, components of the Vibrio fischeri quorum sensor encoded by luxR-PluxI have been fused to modified versions of gfpmut3∗ genes encoding unstable green fluorescent proteins. Bacterial strains harboring this green fluorescent se
American Society for Microbiology.
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9. Acyl-homoserine lactone quorum sensing in Gram-negative bacteria: A signaling mechanism involved in associations with higher organisms
Recent advances in studies of bacterial gene expression have brought the realization that cell-to-cell communication and community behavior are critical for successful interactions with higher organisms. Species-specific cell-to-cell communication is involved in successful pathogenic or symbiotic interactions of a variety of bacteria with plant and anim
The National Academy of Sciences.
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10. Detection of N-(3-Oxohexanoyl)-l-Homoserine Lactone in Mice Infected with Yersinia enterocolitica Serotype O8
Yersinia enterocolitica synthesizes N-acyl-l-homoserine lactone (AHL) signal molecules via the LuxR-LuxI homologues YenR-YenI. In this study we checked two prototypes of mouse-virulent Y. enterocolitica serotype O8 strains WA-314 and 8081 for AHL production in vitro and in vivo (mouse infection model). We used thin-layer chromatography in combination with th
American Society for Microbiology.
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11. The Ti Plasmid of Agrobacterium tumefaciens Harbors an attM-Paralogous Gene, aiiB, Also Encoding N-Acyl Homoserine Lactonase Activity
The Agrobacterium tumefaciens C58 genome contains three putative N-acyl homoserine lactone (acyl-HSL) hydrolases, which are closely related to the lactonase AiiA of Bacillus. When expressed in Escherichia coli, two of the putative acyl-HSL hydrolases, AttM and AiiB, conferred the ability to degrade acyl-HSLs on the host. In Erwinia strain 6276, the lactonase
American Society for Microbiology.
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12. Multiple N-acyl-L-homoserine lactone signal molecules regulate production of virulence determinants and secondary metabolites in Pseudomonas aeruginosa.
Pseudomonas aeruginosa produces a spectrum of exoproducts many of which have been implicated in the pathogenesis of human infection. Expression of some of these factors requires cell-cell communication involving the interaction of a small diffusible molecule, an "autoinducer," with a positive transcriptional activator. In P. aeruginosa PAO1, LasI directs the